Dearomatization−Bis-alkylation of Aromatic and Heteroaromatic Diesters Promoted by Me<sub>3</sub>SnLi via a Stanna−Brook Rearrangement
作者:Pablo Monje、Paula Graña、M. Rita Paleo、F. Javier Sardina
DOI:10.1021/ol053130r
日期:2006.3.2
Reaction of Me3SnLi with aromatic and heteroaromatic diesters proceeds through a fast stanna-Brook rearrangement that generates an stable bis-enolate which can be regioselectively alkylated and cyclized, in one step, to bicyclic compounds containing 6,5-, 6,6-, and 6,7-fused ring systems.
作者:Timothy J. Donohoe、Andrew J. McRiner、Peter Sheldrake
DOI:10.1021/ol0065930
日期:2000.11.1
[GRAPHICS]The partial reduction of electron-deficient pyridines is described herein. Mono- and disubstituted pyridines can be transformed into functionalized dihydropyridines using either Birch reduction conditions or sodium/naphthalene in THF. The compounds formed by these high-yielding reductive alkylation protocols have potential as synthetic intermediates, and we have shown that bicycle compounds containing 6,5, 6,6, and 6,7 ring systems can be prepared in one step via a base-promoted cylization.